Not Ranked
,,,that backfire thing sure does point to blown power valve all right.....
I never did figure out a "consistent" way to check them other than "replace".
As far as accellerator "pump shot" you can look down the throat of the carb and SEE it injecting gas, which it better be doing in front AND back. Manual secondaries would indicate it is in fact a "double pumper" (two acclerator pumps, fore and aft). My guess is the double pumper would NOT have power valve protection! Thats actually a fairly rare carb., most were vacuum secondary.
Ernie
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